A Usadel-theory stability analysis determines the vortex-free-state instability field of a superconducting thin-film strip without a core cutoff, yielding three width regimes and B_s proportional to 1/W in wide strips.
The physical interpretation is as follows
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Microscopic theory of the field-induced instability of the vortex-free state in superconducting thin-film strips
A Usadel-theory stability analysis determines the vortex-free-state instability field of a superconducting thin-film strip without a core cutoff, yielding three width regimes and B_s proportional to 1/W in wide strips.